I also bought that kit from Harbor Freight. Only problem I had with them was on the lift pump, fitting in the slots. They are way thicker than the stock ones.
With my air leak, I am thinking of pulling the lift pump again and checking all those fittings. Has to be where my bubbles are coming from.

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'85 300TD- current toy
'04.5 Cummins- Daily Driver
'70 Chevelle- under construction
'63 Split Window- under construction